My female sealpoint siamese cat, Lika, has been constipated. She is 16 years old and has historically eated Science Diet dry cat food. She turns her nose up at canned foid; I have tried many. I have tried putting mineral oil on her treats and she would sometimes eat them but now will not, at all. She is still eating and she drinks a lot of water. She is active, bright, and seems to usually be in no distress. Her abdomen does not feel hard or distended. She vomits on occasion after which she sometimes poops. For the past two weeks she has been straining as if to poop but nothing comes out. I gave her an enema 4 days ago and it was successful. She had not pooped since, so I gave her another enema today, with success but with not as much poop obtained as there should have been after 4 days. Her stool is very hard. I would like to know if I can give her liquid docusate sodium , which I can buy in the grocery store and if so, how much can I give to my 5 lb. cat. How do I administer it? I would not want her to aspirate any medicine I’d give her. I am trying to avoid large vet bills because of my financial situation and bevause Lika is an old cat and I prefer to avoid any major costly intervention(s).